LS2801R5DCKA datasheet(2/16 Pages) IRF

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LS-SERIES

(28V Input, Single/Dual Output)

The LS-Series converters utilize a single-ended

forward topology with resonant reset. The nominal

switching frequency is 500kHz. Electrical isolation

and tight output regulation are achieved through the

use of a magnetically coupled feedback. Voltage

feed-forward with duty factor limiting provides high

line rejection and protection against output over

voltage in the event of an internal control loop failure.

Circuit Description

An internal EMI filter allows the converter to meet

the conducted emissions requirements of MIL-STD-

461C on the input power leads.

An external inhibit port is provided to control

converter operation. The converter’s operation is

inhibited when this pin is pulled low. It is intended

to be driven by an open collector logic device. The

pin may be left open for normal operation and has a

nominal open circuit voltage of 11V with respect to

the input return (pin 2).

Output current is limited under any load fault

condition to approximately 125% of rated. An

overload condition causes the converter output

voltage to drop below nominal. The converter will

resume normal operation when the load current is

reduced below the current limit point. This protects

the converter from both overload and short circuit

conditions. The current limit point exhibits a slightly

negative temperature coefficient to reduce the

possibility of thermal runaway.

The LS-Series was developed using a proven

conservative design methodology derived from other

space level designs that includes selection of

established reliability components and fully de-

rating to the requirements of MIL-STD-975

except

for the CDR type of capacitors, a capacitor with 50V

rating is used for in-circuit voltage stress of less

than10V. A magnetic feedback circuit is utilized

instead of opto -couplers to minimize temperature,

aging and radiation sensitivity. PSPICE was used

extensively to predict and optimize circuit

performance for both beginning and end-of-life.

Thorough design analyses include stress, thermal,

and reliability (MTBF).

The output voltage of all models can be adjusted

using a single external resistor.

Design Methodology

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